http://mat.i2p
6/21/2019 A domain hack is a domain in which both the top level domain (TLD) and the second level domain (SLD) are combined to make up a word or phrase. For example, matdoes. dev is a domain hack for mat does dev.
Domain hacks are not security- related and they are completely legal. Most domain hacks use country code top level domains (ccTLDs), for example, .it is for italy, .am is for Armenia, etc.